LET clause
LET (alias = expression) [, (alias = expression)]*
LET stores the result of a sub-expression in order to use it in subsequent clauses.
Aliases in the LET clause create new names that can be referred to anywhere in the query.
LET (alias = expression) [, (alias = expression)]*
LET stores the result of a sub-expression in order to use it in subsequent clauses.
Aliases in the LET clause create new names that can be referred to anywhere in the query.